Cocaine addiction is hard to break. Addicts need cocaine to feel any pleasure, so perhaps giving them an antidepressant drug will help. An experiment assigned chronic cocaine users to take either an antidepressant drug called desipramine, lithium, or a placebo. Lithium is a standard drug to treat cocaine addiction. A placebo is a dummy drug, used so that the effect of being in the study but not taking any drug can be seen. Here are the results after three years. Desipramine Lithium Placebo Relapse 11 20 23 No relapse 15 6 What proportion of subjects did not relapse? (round your answer to three decimal places)

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Cocaine addiction is hard to break. Addicts need cocaine to feel any pleasure, so perhaps giving them an
antidepressant drug will help. An experiment assigned chronic cocaine users to take either an antidepressant
drug called desipramine, lithium, or a placebo. Lithium is a standard drug to treat cocaine addiction. A
placebo is a dummy drug, used so that the effect of being in the study but not taking any drug can be seen.
Here are the results after three years.
Desipramine Lithium Placebo
Relapse
11
20
23
No relapse
15
What proportion of subjects did not relapse?
(round your answer to three decimal places)
Transcribed Image Text:Cocaine addiction is hard to break. Addicts need cocaine to feel any pleasure, so perhaps giving them an antidepressant drug will help. An experiment assigned chronic cocaine users to take either an antidepressant drug called desipramine, lithium, or a placebo. Lithium is a standard drug to treat cocaine addiction. A placebo is a dummy drug, used so that the effect of being in the study but not taking any drug can be seen. Here are the results after three years. Desipramine Lithium Placebo Relapse 11 20 23 No relapse 15 What proportion of subjects did not relapse? (round your answer to three decimal places)
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